[Gretl-devel] Gamma probability density function

Artur T. artur.tarassow at googlemail.com
Tue Feb 16 08:37:30 EST 2016


Damn, yes you are right!!

Artur


Am 16.02.2016 um 14:36 schrieb Juan C. Estévez:
> Sorry. I mean that in Matlab example, varies de B parameter, but in
> gretl example I think that the X varies. No?
> 
> On 16/02/2016 14:32, Artur T. wrote:
>> Yes, just the syntax differs but of course results should be the same.
>>
>> So you can confirm that Excel computes the same values as gretl does?
>>
>> Artur
>>
>> Am 16.02.2016 um 14:29 schrieb Juan C. Estévez:
>>> No. Sorry I confuse de parameters. Excel makes gives de same results.
>>>
>>> On 16/02/2016 14:28, Juan C. Estévez wrote:
>>>> Maybe Matlab calculates gamma(X, a, b), not gamma (a, b, X)?
>>>>
>>>> On 16/02/2016 13:08, Artur T. wrote:
>>>>> Dear all,
>>>>>
>>>>> I am just trying to replicate this MATLAB example of the Gamma
>>>>> probability density function:
>>>>>
>>>>> http://de.mathworks.com/help/stats/gampdf.html?requestedDomain=www.mathworks.com#zmw57dd0e292788
>>>>>
>>>>> According to this, Matlab yields for shape=scale=1 and a x-vector seq(1,5) :
>>>>> y = 0.3679  0.3033  0.2388  0.1947  0.1637
>>>>>
>>>>> but with gretl I obtain correctly (just checked it with some statistical
>>>>> tables)
>>>>> y (1 x 5)
>>>>> 0.36788 0.13534 0.049787 0.018316 0.0067379
>>>>>
>>>>> <hansl>
>>>>> mu = seq(1,5)
>>>>> y = pdf(g,1,1,mu)
>>>>> </hansl>
>>>>>
>>>>> Just out of curiosity: What is Matlab doing? (the same results are
>>>>> obtained by Octave)
>>>>>
>>>>> Artur
>>>
>>>
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> 
> 
> 
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